Nokia 9110 Setting Up Dial-in Service Manual
Also see for COMMUNICATOR 9110: User manualSoftware guideQuick guideQuick guideConnection guide
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SETTING UP DIAL-IN SYSTEM 16 (16)Mobile Phones3.1 21.04.99Copyright©Nokia Mobile Phones 1999• Switch type: Euro-ISDN• Mode: AsynchronousWith these settings in the Shiva terminal server end, and AT+CBST=71 in the communicator’s modeminitialisation, the ISDN connection with Shiva works.5. KNOWN PROBLEMSThis section presents the settings needed to solve some known connectivity problems. In some cases, it isnecessary to explain the situation further so that the problem case can be solved.5.1. ISDN ConnectionsISDN dial-in lines can create interesting problems. In most cases, when the dial-in system has been configured,the only thing left to do is to set the communicator as a null modem. Thus the ISDN modem does not care aboutthe speed of the communicator. To set up the communicator as a null modem:In the Internet application, choose Settings ‡ choose Internet access ‡ highlight the Internetaccess point and press Edit ‡ choose Advanced settings ‡ and type “AT+CBST=71” into theModem initialisation field.Note: The GSM network operator must support ISDN data calls.5.2. Shiva Terminal ServersThe communicator supports PAP and CHAP protocols in PPP connection authentication. Shiva has its ownauthentication protocol called SPAP that the communicator does not support. When using a Shiva terminal serverwith the communicator, some configuration settings must be changed. Since SPAP cannot be used, a TACACSserver should be set-up and configured to the Shiva (extended TACACS is recommended). In the communicator,the compression option must be off. The configurations are explained in more detail in section 3.5.3. PPP Data Calls Over Long DistancesIf some of the dial-up connections to the PPP service are made over exceptionally long delay links, if the PPPserver uses the default 3-second restart timer, the service provider’s PPP protocol state machine may be unableto converge the option negotiations.An example of a long delay link is a GSM data call from Hong Kong to Helsinki, Finland. The Radio Link Protocol(RLP) of GSM that is used to provide reliable asynchronous data service over the wireless link adds more delay tothe satellite link delays. This problem can be avoided by configuring the PPP server to use a greater restart timervalue (e.g. 11 seconds) or to configure the PPP server to use some dynamic scheme for updating the restart timervalue if the server is capable of doing so. |
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